Evgeniy Stepanov 74f96070c3 MemTag: unchecked load/store optimization. ... Summary: MTE allows memory access to bypass tag check iff the address argument is [SP, #imm]. This change takes advantage of this to demote uses of tagged addresses to regular FrameIndex operands, reducing register pressure in large functions. MO_TAGGED target flag is used to signal that the FrameIndex operand refers to memory that might be tagged, and needs to be handled with care. Such operand must be lowered to [SP, #imm] directly, without a scratch register. The transformation pass attempts to predict when the offset will be out of range and disable the optimization. AArch64RegisterInfo::eliminateFrameIndex has an escape hatch in case this prediction has been wrong, but it is quite inefficient and should be avoided. Reviewers: pcc, vitalybuka, ostannard Subscribers: mgorny, javed.absar, kristof.beyls, hiraditya, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D66457 llvm-svn: 370490		2019-08-30 17:23:02 +00:00
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AArch64BaseInfo.cpp
AArch64BaseInfo.h	MemTag: unchecked load/store optimization.	2019-08-30 17:23:02 +00:00
CMakeLists.txt
LLVMBuild.txt